Window ventilator



R 0L T fin 9 M PWM Low DI- NH W Feb. 20, 1923.

INVENTOR.

HN P'R-ATTV Patented Feb. 20, 1923.

JOHN PRATT, OF TORONTO, ONTARIO, CANADA.

WINDOW VENTILATOR.

Application filed. May 9, 1921. Serial No. 467,934.

To all whom 2'25 may concern:

Be it known that 1, JOHN PRATT, a subject of the King of Great Britain, and a resident of the city of Toronto, in the county of York, in the Province of Ontario, Canada, have invented certain new and useful Improvements in WVindow Ventilators, of which the following is the specification. I

My invention relates to improvements in window vent lators and the object of the invention is to devise a simpleform of ventilator of this type adaptable for use in winter weather which willsupply the room with an adequate amount of fresh air and may be easily and cheaplymanufactured and it consists essentially of the arrangement and construction of parts as hereinafter more particularly explained.

Fig. 1 is a front elevation of a window looking from the outside and showing my storm window inv place.

Fig. 2 a vertical section through Fig. 1.

In the drawings like characters of referen e indicate correspondingparts in each figure.

1 indicates the window frame which is provided with the usual guide rails2 and 3 and stop rails 4 and 5 extending across the top of the frame between the guide ra ls. 6 is the upper sash slidable between the guide rails 2 and 3, and 7 is the lower sash slidable between the guide rail 2 and the outer window stop 8. 9 is a storm window which is secured inv place by any suitable means. The storm window 9 is slightly less in height than the height of the window frame thereby leaving an opening 10 interposed between the top edge of the storm window and the window frame. 11 is a cross strip which is secured to the inner face of the storm window flush with the upper edge thereof and adapted to fill the space between the frame of the storm window and the frame of the upper sash 6.

It will thus be seen that when the upper sash is lowered so that its: upper edge is carried to the upper edge of the cross strip 11, an opening is left for the free passage of air from the outside of the house into the interior of theroom. The cold air passmg through this opening enters the room and gradually falls downward displacing the impure air which gradually filters out "at thetop of the storm window 9. The hood l2 prevents a dire-i'tdraft offair passing through the opening 10'wh1ol would be undesirable 1n stormy weather and also prevents snow blowing in. through such opening. In milder weather the lower sash 7 of the window may be raised and the slotted opening 13 which is usually located at the bottom of all storm windows is opened so as to allow ofa freer circulation of air. From this description itwill be seen that I have devised a very simple form of veni tilator particularly adaptable for use in winter weather and which Wlll be simple, easy and cheap to make and wl'uch-will provide an adequate supply of air to ventilate' i the room efiiciently.

If found desirablea strip of wood may be inserted between the parting rails to prevent the frost entering whenthe window is in the ventilating position.

What I claim as my lnvention is:

cin'ed to the inner face of the storm sash In a window structure, the comb nation with a window frame and upper and lower sash thereof, of a storm sash suitably sej cured to the frame and of slightly less height at its upperend and eXtendingfrom side a to side thereof and adapted to' fill-the interrent'ng space between the storm sash and the uppersash of the window to prevent the inward passage of air between the storm sash and the upper window sash until. said upper sash is lowered below the bottom edge of said filling str1p'w1thout preventing a free inward passage of an 1nto the room.

JOHN PRATT. 

